36 



A PLANT-DISEASE SURVEY IN TEXAS. 



antliracnose. It may be noted that this species is still retained under 

 the genus Gloeosporium by Lindau (37), since the production of 

 setae is of such rare occurrence. It is known to attack seeds, pods, 

 leaves, and stems. C olletoirichum lagenarium (Pass.) Ell. and Hal., 

 has been reported as occurring on different species of beans by two 

 different writers (28 and 50). The report rests on the assumption bv 

 Halsted that the two above-mentioned species are identical. 



The identity of these two species is not considered sufficiently 

 established (37), so they must still be treated as separate. A com- 

 parison of our species with the two mentioned may be made as 

 follows: 



Table V. — Comparison of characters of species of CoUetotrichum. 



A comparison of the above characters will make it plain that our 

 specimens represent a new specias, which has been described in 

 Mj'^cologia (32). 



Specimen collected: Uvalde. 1963 (type specimen). 



Bacterial blight {Bncterium pliaseoli Erw. Sm.). — This disease is 

 common on the foliage of both string and Lima beans, but the symp- 

 tomatology is somewhat different in each. On the leaves of string 

 beans it causes extended, brown, dead areas which appear near the 

 margin or tip and advance into the leaf, or the original foci may be 

 removed from the margin and so cause a conspicuous spotting which 

 is generally accompanied by more or less chlorosis. On the Lima 

 bean the progress of the disease is often marked in the same way, but 

 frequently small circular or someAvhat irregular reddish pustules are 

 present. These pustules are found filled with an abundance of bac- 

 teria. This symptom has been ob.served by the senior writer, in 

 Nebraska, and a somewhat similar condition is reported by Clin- 

 ton (7). A bacterial rot of the pods, due to the same organism which 

 affects the leaves, and affecting both green-podded and yellow-podded 

 varieties, has been observed. It appears first as small watery or 

 pellucid areas along the sutures, which spread and give an oppor- 

 tunity for the inroads of fungi. This bacteriosis of the pods is es- 

 pecially favored by frequent and abundant rains. 



Specimens collected: (1) On Phaseolus vulgaris L. — San Antonio, 1406 



(leaves and pods): Austin, 1427: Stockdalo. 2641. (2) On P. lunatus L.— 

 Austin. 1540 ; San Antonio, 1784 ; Uvalde. 1932. 

 226 



